Iron Cycle

1. Microbial Growth

1.1. Limited by availability of iron

2. Aerobic

2.1. Acidic (oxidation) pH <5: FeO -> Fe2+ pH >5: Fe2+ [O] -> Fe3+

2.2. Neutral (chelation)

3. Anaerobic

3.1. Reduction

3.2. Precipitation

3.2.1. New Topic

4. Oxidation-reduction reactions

4.1. Reduction: Fe3+ -> Fe2+

4.2. Oxidation: Fe2+ + [O] -> Fe3+

5. General Cycle

5.1. Soil

5.2. Plant

5.3. Herbivores

5.4. Predators

6. Aerated Conditions

6.1. Bacteria obtaining energy from oxidation of Fe2+ are iron oxidising bacteria

7. Microbial metal transformation

7.1. Iron scavenging and uptake

7.2. Iron oxidation and precipitation

7.3. Iron reduction and solubilisation